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nuttx-apps/system/critmon/critmon.c

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/****************************************************************************
* apps/system/critmon/critmon.c
*
* Copyright (C) 2013, 2018 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <stdbool.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <fcntl.h>
#include <dirent.h>
#include <sched.h>
#include <syslog.h>
#include <errno.h>
#ifdef CONFIG_SYSTEM_CRITMONITOR
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#ifndef CONFIG_SYSTEM_CRITMONITOR_STACKSIZE
# define CONFIG_SYSTEM_CRITMONITOR_STACKSIZE 2048
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_PRIORITY
# define CONFIG_SYSTEM_CRITMONITOR_PRIORITY 50
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_INTERVAL
# define CONFIG_SYSTEM_CRITMONITOR_INTERVAL 2
#endif
#ifndef CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT
# define CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/proc"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
struct critmon_state_s
{
volatile bool started;
volatile bool stop;
pid_t pid;
char line[80];
};
/****************************************************************************
* Private Data
****************************************************************************/
static struct critmon_state_s g_critmon;
#if CONFIG_TASK_NAME_SIZE > 0
static const char g_name[] = "Name:";
#endif
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: critmon_isolate_value
****************************************************************************/
static FAR char *critmon_isolate_value(FAR char *line)
{
FAR char *ptr;
while (isblank(*line) && *line != '\0')
{
line++;
}
ptr = line;
while (*ptr != '\n' && *ptr != '\r' && *ptr != '\0')
{
ptr++;
}
*ptr = '\0';
return line;
}
/****************************************************************************
* Name: critmon_process_directory
****************************************************************************/
static int critmon_process_directory(FAR struct dirent *entryp)
{
FAR const char *tmpstr;
FAR char *filepath;
FAR char *maxpreemp;
FAR char *maxcrit;
FILE *stream;
int errcode;
int len;
int ret;
#if CONFIG_TASK_NAME_SIZE > 0
FAR char *name = NULL;
/* Read the task status to get the task name */
filepath = NULL;
ret = asprintf(&filepath, CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/%s/status",
entryp->d_name);
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: Failed to create path to status file: %d\n",
errcode);
return -errcode;
}
/* Open the status file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
while (fgets(g_critmon.line, 80, stream) != NULL)
{
g_critmon.line[79] = '\n';
len = strlen(g_name);
if (strncmp(g_critmon.line, g_name, len) == 0)
{
tmpstr = critmon_isolate_value(&g_critmon.line[len]);
if (*tmpstr == '\0')
{
ret = -EINVAL;
goto errout_with_stream;
}
name = strdup(tmpstr);
if (name == NULL)
{
ret = -EINVAL;
goto errout_with_stream;
}
}
}
free(filepath);
fclose(stream);
#endif
/* Read critical section information */
filepath = NULL;
ret = asprintf(&filepath, CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "/%s/critmon",
entryp->d_name);
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: Failed to create path to Csection file: %d\n",
errcode);
ret = -EINVAL;
goto errout_with_name;
}
/* Open the Csection file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
/* Read the line containing the Csection max durations */
if (fgets(g_critmon.line, 80, stream) == NULL)
{
ret = -errno;
fprintf(stderr, "Csection Monitor: Failed to read from %s: %d\n",
filepath, ret);
goto errout_with_filepath;
}
/* Format: X.XXXXXXXXXXXX,X.XXXXXXXXX */
maxpreemp = g_critmon.line;
maxcrit = strchr(g_critmon.line, ',');
if (maxcrit != NULL)
{
*maxcrit++ = '\0';
}
else
{
maxcrit = "None";
}
/* Finally, output the stack info that we gleaned from the procfs */
#if CONFIG_TASK_NAME_SIZE > 0
printf("Thread %s (ID %s):\n", name, entryp->d_name);
#else
printf("Thread ID %s:\n", entryp->d_name);
#endif
printf(" Max Pre-emption Disable: %s%12s\n", maxpreemp);
printf(" Max Critical Section: %s%12s\n", maxcrit);
ret = OK;
errout_with_stream:
fclose(stream);
errout_with_filepath:
free(filepath);
errout_with_name:
#if CONFIG_TASK_NAME_SIZE > 0
if (name != NULL)
{
free(name);
}
#endif
return ret;
}
/****************************************************************************
* Name: critmon_check_name
****************************************************************************/
static bool critmon_check_name(FAR char *name)
{
int i;
/* Check each character in the name */
for (i = 0; i < NAME_MAX && name[i] != '\0'; i++)
{
if (!isdigit(name[i]))
{
/* Name contains something other than a decimal numeric character */
return false;
}
}
return true;
}
/****************************************************************************
* Name: critmon_global_crit
****************************************************************************/
static void critmon_global_crit(void)
{
FAR char *filepath;
FAR char *cpu;
FAR char *maxpreemp;
FAR char *maxcrit;
FILE *stream;
int errcode;
int ret;
/* Read critical section information */
filepath = NULL;
ret = asprintf(&filepath, CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT "critmon");
if (ret < 0 || filepath == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: Failed to create path to Csection file: %d\n",
errcode);
return;
}
/* Open the Csection file */
stream = fopen(filepath, "r");
if (stream == NULL)
{
errcode = errno;
fprintf(stderr, "Csection Monitor: Failed to open %s: %d\n",
filepath, errcode);
goto errout_with_filepath;
}
/* Read the line containing the Csection max durations for each CPU */
while (fgets(g_critmon.line, 80, stream) != NULL)
{
/* Format: X,X.XXXXXXXXXXXX,X.XXXXXXXXX */
cpu = g_critmon.line;
maxpreemp = strchr(g_critmon.line, ',');
if (maxpreemp != NULL)
{
*maxpreemp++ = '\0';
maxcrit = strchr(g_critmon.line, ',');
if (maxcrit != NULL)
{
*maxcrit++ = '\0';
}
else
{
maxcrit = "None";
}
}
else
{
maxpreemp = "None";
maxcrit = "None";
}
/* Finally, output the stack info that we gleaned from the procfs */
printf("CPU %s:\n", cpu);
printf(" Max Pre-emption Disable: %s%12s\n", maxpreemp);
printf(" Max Critical Section: %s%12s\n", maxcrit);
}
fclose(stream);
errout_with_filepath:
free(filepath);
}
/****************************************************************************
* Name: critmon_daemon
****************************************************************************/
static int critmon_daemon(int argc, char **argv)
{
DIR *dirp;
int exitcode = EXIT_SUCCESS;
int errcount = 0;
int ret;
printf("Csection Monitor: Running: %d\n", g_critmon.pid);
/* Loop until we detect that there is a request to stop. */
while (!g_critmon.stop)
{
/* Wait for the next sample interval */
sleep(CONFIG_SYSTEM_CRITMONITOR_INTERVAL);
/* Should global usage first */
critmon_global_crit();
/* Open the top-level procfs directory */
dirp = opendir(CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT);
if (dirp == NULL)
{
/* Failed to open the directory */
fprintf(stderr, "Csection Monitor: Failed to open directory: %s\n",
CONFIG_SYSTEM_CRITMONITOR_MOUNTPOINT);
if (++errcount > 100)
{
fprintf(stderr, "Csection Monitor: Too many errors ... exiting\n");
exitcode = EXIT_FAILURE;
break;
}
}
/* Read each directory entry */
for (; ; )
{
FAR struct dirent *entryp = readdir(dirp);
if (entryp == NULL)
{
/* Finished with this directory */
break;
}
/* Task/thread entries in the /proc directory will all be (1)
* directories with (2) all numeric names.
*/
if (DIRENT_ISDIRECTORY(entryp->d_type) &&
critmon_check_name(entryp->d_name))
{
/* Looks good -- process the directory */
ret = critmon_process_directory(entryp);
if (ret < 0)
{
/* Failed to process the thread directory */
fprintf(stderr,
"Csection Monitor: Failed to process sub-directory: %s\n",
entryp->d_name);
if (++errcount > 100)
{
fprintf(stderr, "Csection Monitor: Too many errors ... exiting\n");
exitcode = EXIT_FAILURE;
break;
}
}
}
}
closedir(dirp);
}
/* Stopped */
g_critmon.stop = false;
g_critmon.started = false;
printf("Csection Monitor: Stopped: %d\n", g_critmon.pid);
return exitcode;
}
/****************************************************************************
* Public Functions
****************************************************************************/
int critmon_start_main(int argc, char **argv)
{
/* Has the monitor already started? */
sched_lock();
if (!g_critmon.started)
{
int ret;
/* No.. start it now */
/* Then start the stack monitoring daemon */
g_critmon.started = true;
g_critmon.stop = false;
ret = task_create("Csection Monitor", CONFIG_SYSTEM_CRITMONITOR_PRIORITY,
CONFIG_SYSTEM_CRITMONITOR_STACKSIZE,
(main_t)critmon_daemon, (FAR char * const *)NULL);
if (ret < 0)
{
int errcode = errno;
printf("Csection Monitor ERROR: Failed to start the stack monitor: %d\n",
errcode);
}
else
{
g_critmon.pid = ret;
printf("Csection Monitor: Started: %d\n", g_critmon.pid);
}
sched_unlock();
return 0;
}
sched_unlock();
printf("Csection Monitor: %s: %d\n",
g_critmon.stop ? "Stopping" : "Running", g_critmon.pid);
return 0;
}
int critmon_stop_main(int argc, char **argv)
{
/* Has the monitor already started? */
if (g_critmon.started)
{
/* Stop the stack monitor. The next time the monitor wakes up,
* it will see the stop indication and will exist.
*/
printf("Csection Monitor: Stopping: %d\n", g_critmon.pid);
g_critmon.stop = true;
}
printf("Csection Monitor: Stopped: %d\n", g_critmon.pid);
return 0;
}
#endif /* CONFIG_SYSTEM_CRITMONITOR */
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